How far apart should cosmos plants be?
They should be planted 30 to 45 cm (12-15 inches) away from each other to allow for bushy growth. If your garden is in a windy location it is a good idea to stake and tie the plants. However, normally the plants should be sturdy enough to require support.
How far apart cosmos seeds?
Just sow seeds lightly—no more than 1/4-inch deep. Thin to 12–18 inches apart when seedlings are a few inches tall.
How long does it take for cosmos seeds to sprout?
Seeds will germinate in 7–10 days at a soil temperature of 68–72°F (20–22°C). Thin to 9–12” apart when the first true leaves appear. To transplant: sow seed thinly in flats, barely covering the seeds, 5–7 weeks before setting out.
How long does it take for cosmos to bloom from seed?
Cosmos are incredibly easy to grow, making them perfect for beginning gardeners. Seeds can be started indoors to get a jump-start on the season or sown directly into garden beds once the weather warms. Either way, cosmos will bloom in just under 3 months from the date you sow them.
How long does it take for cosmos to grow from seed?
Cosmos are half-hardy annuals that grow, flower, set seed and die all in one year, but unlike hardy annuals, they can’t withstand low temperatures. They’re quick and easy to grow from seed, flowering in as little as 12 weeks, and can be added to borders and pots for a burst of showy colour.
Do cosmos like sun or shade?
Light: Cosmos prefer full sun conditions, except in extreme heat where they can tolerate part shade. Soil: Prepare the garden with loose, weed-free soil. Cosmos prefer dry, arid soil over wet conditions.
Why are my Cosmos seedlings falling over?
The most common cause of legginess is an insufficient or uneven access to light. When the light source is too dim or distant, seedlings grow quickly in height to get closer to that light. As the seedling gains height, it sacrifices in girth and strength, resulting in thin, pale, fragile, stretched-out stems.